Difficulties in creating Personalized Address Lists

Hello, I hope everyone is well...
Thank you very much Vasil Michev for his return...

If I may, let me ask if the logic for this outline is correct:

I adjusted the "CustomAttribute11" field of the domain accounts as desired (in this case I did it with two accounts of each):
Set-Mailbox email address removed for privacy reasons -CustomAttribute11 "DOMAIN1"
Set-Mailbox email address removed for privacy reasons -CustomAttribute11 "DOMAIN2"

That done, I created the lists:
New-AddressList -Name 'DOMAIN1'
New-AddressList -Name 'DOMAIN2'

Finally, I adjusted the list as follows:
Set-AddressList -Identity "DOMAIN1" -ConditionalCustomAttribute11 "DOMAIN1" -IncludedRecipients MailboxUsers

Set-AddressList -Identity "DOMAIN2" -ConditionalCustomAttribute11 "DOMAIN2" -IncludedRecipients MailboxUsers

I remove/clean the CustomAttribute11 attribute field (which is what I chose to use)
Set-Mailbox email address removed for privacy reasons -CustomAttribute11 $null
Set-Mailbox email address removed for privacy reasons -CustomAttribute11 $null

Is this the same idea? The "playback" time in the Exchange environment which is "tense" since we don't know if something is happening or not hehehe

Finally, now rereading, I found myself thinking that: When before I applied the "Set-AddressList" command twice where once I used "-RecipientFilter "(RecipientType -eq 'UserMailbox')"" and on the other "-RecipientFilter "(UserPrincipalName -like '*@domain1.com')"" I didn't actually add the two together. One overwrote the other.

I applied it here, as I mentioned above... I'm waiting to see "what happens".

Well, thank you very much for your feedback, for your help. Not only does it help me to better understand these applications, which are all new to me, but it makes me want to learn and do more and more.

Thank you very much, I look forward to your return and Hugs to all!!!