Firebase Cloud Messaging Cannot parse topic name

Question

I\'m trying to subscribe to a topic in my iOS app, but keep getting the error:

 Cannot parse topic name /topics/pets/cnlLksAxmdYP         


        

Answer 1

The / character is not an allowed character for a topic name.

Characters allowed are:

• a-z
• A-Z
• 0-9
• -, _, ., ~, %

I can confirm these are the only allowed characters by testing in Android with a topic name of pets/123asd and the logs shown:

Invalid topic name: Pets/123asd does not match the allowed format [a-zA-Z0-9-_.~%]{1,900}

For iOS, the prefix /topics/ is needed and is still valid. The invalid characters only apply to the topic name you include after the prefix.