Your account could not be used to authorize ArcGis because it is an ArcGis public account

[FranciscoFigueiredo]

Just registered, payed 100 dollars for arcgis pro, I can install it, license it, but after I enter my nickname/password, as I'm about to enter arcpro, this message appears? How to solve it

[DanPatterson]

Sign-in troubleshooting—ArcGIS Pro | Documentation

Solved: Your account could not be used to authorize ArcGIS... - Esri Community

lots of others on a quick web search