Cisco ISE Deployment issue

[teymur azimov]

Hi dears,

I deployed the ISE primary and secondary mode. Then I did deregister the secondary ISE at Primary ISE. Now i want to register the same second ISE as secondary mode on Primary ISE. but this error occur:

Unable to register SecondaryISE. Node is not a Standalone node.

I connect the secondary ISE and see deployement personas

Administration: Secondary

Monitoring: Secondary

Then  I did promote to primary command after that ISE is log out but the problem is not solve.

version 1.20.8xx of both ISE's

How i solve this issue?

Thanks

[Venkatesh Attuluri]

try by promoting the secondary ISE which you  have  de-registered to standlone and try registering it on primary now