Aria Operations 8.x
Incorrect user name and password are used in the SSO SAML configurations.
1. Use a username and password that can log into the SSO server (vCenter).
2. Use vCenter administrator credentials as a workaround.
3. In the meantime, fix the username and password that caused the issue mentioned above by following Step 7 - Step 12 in Configure a Single Sign-On Source in VMware Aria Operations.