I have 2 Atlassian organizations and 2 different companies, they have the same owner. Can I verify a domain in 2 different Atlassian sites?
Welcome to the Community!
Sorry to say you can only claim a domain by one Atlassian Organization at a time. So you would need to release it from the one before the other would be allowed to claim it.
This document has more information under the "Domain verification considerations".
I hope that helps!