diff --git a/backend/internal/dto/custom_claim_dto.go b/backend/internal/dto/custom_claim_dto.go
index 433a1d99..933d34d4 100644
--- a/backend/internal/dto/custom_claim_dto.go
+++ b/backend/internal/dto/custom_claim_dto.go
@@ -6,6 +6,6 @@ type CustomClaimDto struct {
 }
 
 type CustomClaimCreateDto struct {
-	Key   string `json:"key" binding:"required,claimKey"`
+	Key   string `json:"key" binding:"required"`
 	Value string `json:"value" binding:"required"`
 }
diff --git a/backend/internal/dto/validations.go b/backend/internal/dto/validations.go
index 8f083cc3..e2ff7b82 100644
--- a/backend/internal/dto/validations.go
+++ b/backend/internal/dto/validations.go
@@ -16,22 +16,10 @@ var validateUsername validator.Func = func(fl validator.FieldLevel) bool {
 	return matched
 }
 
-var validateClaimKey validator.Func = func(fl validator.FieldLevel) bool {
-	// The string can only contain letters and numbers
-	regex := "^[A-Za-z0-9]*$"
-	matched, _ := regexp.MatchString(regex, fl.Field().String())
-	return matched
-}
-
 func init() {
 	if v, ok := binding.Validator.Engine().(*validator.Validate); ok {
 		if err := v.RegisterValidation("username", validateUsername); err != nil {
 			log.Fatalf("Failed to register custom validation: %v", err)
 		}
 	}
-	if v, ok := binding.Validator.Engine().(*validator.Validate); ok {
-		if err := v.RegisterValidation("claimKey", validateClaimKey); err != nil {
-			log.Fatalf("Failed to register custom validation: %v", err)
-		}
-	}
 }
diff --git a/frontend/src/lib/components/form/auto-complete-input.svelte b/frontend/src/lib/components/form/auto-complete-input.svelte
index 7ab82b38..814a5a2a 100644
--- a/frontend/src/lib/components/form/auto-complete-input.svelte
+++ b/frontend/src/lib/components/form/auto-complete-input.svelte
@@ -16,7 +16,6 @@
 
 	let filteredSuggestions: string[] = $state(suggestions.slice(0, suggestionLimit));
 	let selectedIndex = $state(-1);
-	let keyError: string | undefined = $state();
 
 	let isInputFocused = $state(false);
 
@@ -26,13 +25,6 @@
 	}
 
 	function handleOnInput() {
-		if (value.length > 0 && !/^[A-Za-z0-9]*$/.test(value)) {
-			keyError = 'Only alphanumeric characters are allowed';
-			return;
-		} else {
-			keyError = undefined;
-		}
-
 		filteredSuggestions = suggestions
 			.filter((s) => s.includes(value.toLowerCase()))
 			.slice(0, suggestionLimit);
@@ -83,9 +75,6 @@
 		onfocus={() => (isInputFocused = true)}
 		onblur={() => (isInputFocused = false)}
 	/>
-	{#if keyError}
-		<p class="mt-1 text-sm text-red-500">{keyError}</p>
-	{/if}
 	<Popover.Root
 		open={isOpen}
 		disableFocusTrap