When trying to import a certificate into the User trusted root certificate store we get the error:
“The import failed because the store was read-only, the store was full, or the store did not open correctly" CertMgr error
This appears to work for only one person in the organisation who is a global admin and does not work for anyone else in the organisation (including GA's). This did work prior to migrating from traditional on prem AD to AzureAD.
We have also tried to drag and drop the certificate into CertMgr rather than simply importing and that did not work either, see error here
Other steps that we have tried are: elevating user to GA and local admin neither of which worked.
Running Windows 10, and AzureAD.