Couldn't sign you in

[MeleKoneya1]

I get this error on my work computer using an Enterprise Login to ArcGIS Online to authorize ArcGIS Pro 3.3. I had been working just fine earlier today.    I did see the upper right where it said the connection to ArcGIS Pro was timing out.  When I use ArcGIS Pro 3.3 at home with the same credentials there is no issue.     ToddFagin  mentioned in a similar post https://community.esri.com/t5/arcgis-pro-questions/arcgis-pro-3-3-couldn-t-sign-you-in/m-p/1477782#M...  that it worked for him to downgrade to 3.2.x.   I uninstalled 3.3 and then reinstalled.    I will see if other non 3.3 users have this issue, but any thoughts on what the issue is would be appreciated.    Thank you, Mele

[MeleKoneya1 · Accepted solution]

I ended up working with Esri Support to resolve this.   There was registry key which needed to be removed.   It may have become corrupt

[FredericPoliart_EsriAU]

If you uninstall, make sure the uninstall deleted everything in here:
C:\Program Files\ArcGIS\Pro
c:\Users\Administrator\AppData\Local\Microsoft\Windows\INetCache\ArcGISUpdate\ArcGISPro\ArcGISUpdate.exe

RegEdit Delete everything in:
HKEY_LOCAL_MACHINE\SOFTWARE\ESRI\ArcGISPro
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RADAR\HeapLeakDetection\DiagnosedApplications\  (esri related only)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\bam\State\UserSettings\  (esri related only)
HKEY_USERS\S-1-5-21-4090609309-3682410107-983408365-500\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell\MuiCache  (esri related only)
HKEY_USERS\S-1-5-21-4090609309-3682410107-983408365-500\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.aprx

most importantly delete here:
HKEY_USERS\S-1-5-21-4090609309-3682410107-983408365-500\Software\ESRI\ArcGIS Online For Pro\
^^ that's where all your portal logins are saved

[JodiBintara]

i also getting this problem right now when im trying to login with my google credentials. Any thoughts that you can help?

[MeleKoneya]

 I did work with support and as noted this key was most important to getting my log in working again "ESRI\ArcGIS Online For Pro\ "      If others run into this issue take note of this registry key.   We ended up renaming it and then when ArcGIS Pro restarted, the key was recreated.