Unable to start IP warming process

Hi Folks,

Greetings!

We are trying to strart IP warming phases and following steps is complete and tested internally but giving us error while running on phases :
- Audience Created with profiles to be targted for IP warming
- Campaigns created with above audience creation
- Email Channel configuration completed and tested for delivery.
- Created IP warming plan beginning with phase 1 and using #2 campaigns created for Ip warming schedule.

While I am waiting for IP warming phase to kick in, I am getting below error where the message is:

"The server encountered an internal error and could not execute the run. Duplicate the run to schedule activation at a later date and time."

I did re-run by duplicating the failed ones, and also adjusted the time as per audience evaluation.

My audience is evaluated and ready around 7:30PM EST time and I am running the phase at 9:30/10:30PM EST time to begin IP warming.

Even After multiple Attempts I face same error and support is also not helping to great extent to find out why and what could be potential reasons.

I rely on community Engineers to help me get the right direction to debug this issue and resolve.