There is an open issue about it, it would be best for you to wait till it’s resolved: Failed to add token name with 11+ characters in Metamask · Issue #1466 · blockscout/frontend · GitHub
There is an open issue about it, it would be best for you to wait till it’s resolved: Failed to add token name with 11+ characters in Metamask · Issue #1466 · blockscout/frontend · GitHub