Xfinity Mobile voicemail is not working

I recently switched from Verizon to Xfinity mobile about a month ago. Ever since my voice mail has become inaccessible. I keep getting error messages that at first said the mailbox I was trying to access was not in service and II error message that I started getting was that my call cannot be completed. After about 10 phone calls to XFinity support and doing everything that they told me to do, I contacted Samsung to see if it was an issue that they're aware of. No luck. I have a Galaxy S21 Plus and I'm hoping that somebody, somewhere I can help me.