configuring HA with quorum on big-iq fails

Did you manage to run the auto HA successfully?

It's important to note that the big-iq CM should not function as the quorum; instead, the DCD should be configured as the quorum.

If the initial configuration involved using CM as the quorum, it may have led to unexpected results.

Additionally, have you ensured that the necessary ports for high availability (HA) are permitted between the BIG-IQ units?
You can refer to this link for details: https://my.f5.com/manage/s/article/K15612#ha_peers.

Keep in mind that the HA process involves various checks, and by examining the logs, you can pinpoint the next steps in formulating an action plan.