Bit.ly bitlink creation always return forbidden even after email verification?

The group_guid param needs to reference the id of a group associated with your bitly account. Hit this api endpoint with your generic access token to get a list of the groups/guids bitly has associated with your account: GET https://api-ssl.bitly.com/v4/groups.

Apparently the domain param is optional, because your account may have a default domain associated with it. It worked for me after removing the domain param altogether. https://groups.google.com/forum/#!topic/bitly-api/9RywN3ETLkg

Hope this helps!!

I have been looking around for these issues. Currently, my solution is by removing body group_guid and getting a response 201 (created). I hope my information helps.