easy way to get a uniq id from the device user (google mail adress?)

Hi.
For a chat tool i need to have a unique id from the user, to identify him, if he has a new device. My idea was just to query the google play mail address... but this seems to be not so easy after android 8.0. or is there a easy way, maybe via vcard of the main profile ore something like that?
Thanks a lot & with best regards, Thomas.

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