New source found from dndbeyond.com

ddb_main/components/MaxCharactersMessageText/MaxCharactersMessageText.tsx

@@ -6,12 +6,14 @@ interface MaxCharactersMessageTextProps extends HTMLAttributes<HTMLDivElement> {
   includeTitle?: boolean;
   useLinks?: boolean;
   useMyCharactersLink?: boolean;
+  hasLockedCharacters?: boolean;
 }
 
 export const MaxCharactersMessageText: FC<MaxCharactersMessageTextProps> = ({
   includeTitle,
   useLinks,
   useMyCharactersLink,
+  hasLockedCharacters,
   ...props
 }) => {
   const subscribe = useLinks ? (
@@ -31,6 +33,21 @@ export const MaxCharactersMessageText: FC<MaxCharactersMessageTextProps> = ({
       "My Characters"
     );
 
+  if (hasLockedCharacters) {
+    return (
+      <div {...props}>
+        <p className={styles.messageSubtext}>
+          Your character slots are full. To create a new character, select which
+          characters to keep using the options below, or{" "}
+          <a className={styles.link} href="/store/subscribe">
+            subscribe
+          </a>{" "}
+          to unlock additional slots.
+        </p>
+      </div>
+    );
+  }
+
   return (
     <div {...props}>
       {includeTitle && (