Communication Services: Request to Increase Email Quota and Add New MailForm Address — Ongoing Issue

Problem description

I am seeking assistance to increase the email sending quota for my Azure Communication Services and to enable me to add a new MailFrom address for a custom domain. Despite submitting a quota increase request and verifying my domain, the 'Add' button for MailFrom addresses remains disabled in the portal.

Environment

Azure Communication Services, Email Communication Services scenario, resource: JessieSupport, resource group: Joviahelse, region and subscription details are not specified in the case information.

What I've already tried

I have submitted a support request requesting an increase in the email quota and the addition of another MailFrom address. I verified full access permissions on the resource and resource group. I also confirmed that DNS verification (SPF, DKIM, DKIM2) was complete. I checked the quota status in the portal after the request, signed out and back in, and waited for propagation. However, the 'Add' button for MailFrom addresses remains disabled, and no changes have been observed in quota or portal behavior.

Current status

Currently, the quota has not been increased, and the ability to add a new MailFrom address is still disabled. I am seeking guidance on how to proceed to successfully increase the quota and add the desired MailFrom address.