Hi Daniel,
Additionally, please see the below response that I provided to a user experiencing the same issue. Hope this helps.
Josh
https://community.esri.com/thread/258379-your-account-could-not-be-used-to-authorize-arcgis-pro-because-it-is-an-arcgis-public-account
There are several blog topics here that address your issue,
This one may be of the most help:
https://community.esri.com/community/my-esri/blog/2019/03/04/tips-tricks-arcgis-pro-and-public-accounts
Start there, and if that doesn't help, try a search on GeoNet to find others.
Teresa
What is the solution to this issue, and why the **bleep** can't it be posted online?
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