diff --git a/locale/fr/LC_MESSAGES/django.po b/locale/fr/LC_MESSAGES/django.po
index 5bfc36b..b9c8388 100644
--- a/locale/fr/LC_MESSAGES/django.po
+++ b/locale/fr/LC_MESSAGES/django.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: TFJM\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-03-23 23:02+0100\n"
+"POT-Creation-Date: 2024-03-24 10:29+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: Emmy D'Anello <emmy.danello@animath.fr>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -490,55 +490,59 @@ msgstr "Ce trigramme est déjà utilisé."
 msgid "No team was found with this access code."
 msgstr "Aucune équipe n'a été trouvée avec ce code d'accès."
 
-#: participation/forms.py:85 participation/forms.py:355
+#: participation/forms.py:60 participation/views.py:443
+msgid "The team is already validated or the validation is pending."
+msgstr "La validation de l'équipe est déjà faite ou en cours."
+
+#: participation/forms.py:89 participation/forms.py:359
 #: registration/forms.py:122 registration/forms.py:144
 #: registration/forms.py:166 registration/forms.py:188
 #: registration/forms.py:237 registration/forms.py:270
 msgid "The uploaded file size must be under 2 Mo."
 msgstr "Le fichier envoyé doit peser moins de 2 Mo."
 
-#: participation/forms.py:87 registration/forms.py:124
+#: participation/forms.py:91 registration/forms.py:124
 #: registration/forms.py:146 registration/forms.py:168
 #: registration/forms.py:190 registration/forms.py:239
 #: registration/forms.py:272
 msgid "The uploaded file must be a PDF, PNG of JPEG file."
 msgstr "Le fichier envoyé doit être au format PDF, PNG ou JPEG."
 
-#: participation/forms.py:105
+#: participation/forms.py:109
 msgid "I engage myself to participate to the whole TFJM²."
 msgstr "Je m'engage à participer à l'intégralité du TFJM²."
 
-#: participation/forms.py:120
+#: participation/forms.py:124
 msgid "Message to address to the team:"
 msgstr "Message à adresser à l'équipe :"
 
-#: participation/forms.py:155
+#: participation/forms.py:159
 msgid "The uploaded file size must be under 5 Mo."
 msgstr "Le fichier envoyé doit peser moins de 5 Mo."
 
-#: participation/forms.py:157 participation/forms.py:357
+#: participation/forms.py:161 participation/forms.py:361
 msgid "The uploaded file must be a PDF file."
 msgstr "Le fichier envoyé doit être au format PDF."
 
-#: participation/forms.py:161
+#: participation/forms.py:165
 msgid "The PDF file must not have more than 30 pages."
 msgstr "Le fichier PDF ne doit pas avoir plus de 30 pages."
 
-#: participation/forms.py:228
+#: participation/forms.py:232
 #: participation/templates/participation/pool_detail.html:123
 #: participation/templates/participation/tournament_detail.html:119
 msgid "Add"
 msgstr "Ajouter"
 
-#: participation/forms.py:243
+#: participation/forms.py:247
 msgid "This user already exists, but is a participant."
 msgstr "Cet⋅te utilisateur⋅rice existe déjà, mais en tant que participant⋅e."
 
-#: participation/forms.py:254
+#: participation/forms.py:258
 msgid "CSV file:"
 msgstr "Tableur au format CSV :"
 
-#: participation/forms.py:278
+#: participation/forms.py:282
 msgid ""
 "This file contains non-UTF-8 and non-ISO-8859-1 content. Please send your "
 "sheet as a CSV file."
@@ -546,30 +550,30 @@ msgstr ""
 "Ce fichier contient des éléments non-UTF-8 et non-ISO-8859-1. Merci "
 "d'envoyer votre tableur au format CSV."
 
-#: participation/forms.py:293
+#: participation/forms.py:297
 msgid "Can't determine the pool size. Are you sure your file is correct?"
 msgstr ""
 "Impossible de déterminer la taille de la poule. Êtes-vous sûr⋅e que le "
 "fichier est correct ?"
 
-#: participation/forms.py:313
+#: participation/forms.py:317
 msgid "The following note is higher of the maximum expected value:"
 msgstr "La note suivante est supérieure au maximum attendu :"
 
-#: participation/forms.py:321
+#: participation/forms.py:325
 msgid "The following user was not found:"
 msgstr "L'utilisateur⋅rice suivant n'a pas été trouvé :"
 
-#: participation/forms.py:338
+#: participation/forms.py:342
 msgid "The defender, the opponent and the reporter must be different."
 msgstr ""
 "Les équipes défenseuse, opposante et rapportrice doivent être différent⋅es."
 
-#: participation/forms.py:342
+#: participation/forms.py:346
 msgid "This defender did not work on this problem."
 msgstr "Ce⋅tte défenseur⋅se ne travaille pas sur ce problème."
 
-#: participation/forms.py:361
+#: participation/forms.py:365
 msgid "The PDF file must not have more than 2 pages."
 msgstr "Le fichier PDF ne doit pas avoir plus de 2 pages."
 
@@ -1728,10 +1732,6 @@ msgstr "Carnet de vaccination de {participant}.{ext}"
 msgid "Photo authorizations of team {trigram}.zip"
 msgstr "Autorisations de droit à l'image de l'équipe {trigram}.zip"
 
-#: participation/views.py:443
-msgid "The team is already validated or the validation is pending."
-msgstr "La validation de l'équipe est déjà faite ou en cours."
-
 #: participation/views.py:487
 msgid "The team is not validated yet."
 msgstr "L'équipe n'est pas encore validée."
diff --git a/participation/forms.py b/participation/forms.py
index e8dc0e2..982c8d5 100644
--- a/participation/forms.py
+++ b/participation/forms.py
@@ -54,6 +54,10 @@ class JoinTeamForm(forms.ModelForm):
         access_code = self.cleaned_data["access_code"]
         if not Team.objects.filter(access_code=access_code).exists():
             raise ValidationError(_("No team was found with this access code."))
+        else:
+            team = Team.objects.get(access_code=access_code)
+            if team.participation.valid is not None:
+                raise ValidationError(_("The team is already validated or the validation is pending."))
         return access_code
 
     def clean(self):