Same behavior here.
It seems this occures sinse the last upgrade.
We are using SSO SAML for several weeks with no issues.
Since the last upgrade (fotigate to 7.2.4 due to the last CVE, and fortimanager to 7.2.2) SSO admins cannot refresh devices, the re-install policies fails to etc
Tried to delete the user and reconnect with no effect.