Cannot migrate to M1

I’ve received the email about a last call to migrate to M1 however I do not see the M1 stack option in my Worflow configuration. I can only select the xcode versions but not the machines.

On my builds, I see the option to Run a build on Apple Silicon but that triggers a build on an Intel machine.

Will my account be automatically migrated to a M1 stack?

My account is a “free personnal” account which is still build count / month based as opposed to credit / month based. Maybe that’s the reason?

thanks in advance