On desec.io under Token Management, it does not seem to be possible to copy the Token Identifier text. This field contains what looks like an UUID and the text is not selectable (At least in Firefox). As I understand, I need to use this identifier when using the token management API.
The real reason I need to use the token API is to restrict the permissions of a token via token policies. A real significant improvement would be to be able to edit such policies in the web UI. But I guess you are probably already working on that…