Do you have an internet connection?
If you do is it fast?
yes , i have internet,
Yes, I have, and I already tried with arcgis online and if I can change the basemap.
the only different thing i have done is update to arcgis pro 2.5.2
Is your licensing current?
This is strange. I am also on 2.5.2 and everything if functional.
yes but it's the only new thing I've done. this it's a video.