Issue with Mailboxes Limitation in Campaign Launch

Hi Team,

While attempting to launch a campaign, I'm encountering an error that says, "The number of mailboxes must be within the range." I currently have 56 mailboxes added, and the campaign is set up with 1,000 contacts and a 3-step sequence.

Can you please investigate this issue and provide guidance on the allowed mailbox range for the campaign? Let me know if any adjustments are needed on my end.

Thank you!