GOOGLE messages and Samsung messages error

[legallyrupear]

So got my Samsung a72 it's great and was a good replacement to my iPhone 6. Google messages was an OK replacement of imessgae until its stuck on trying to verify my number... so I turn to the messages app that comes with Samsung and I found out in settings there's an option to register for a free chat servicr ( chat one on one). However when I try to enable it it fails. Any one can help with this one? 

[Tsogo_sam05]

Hi, legallyrupear kindly provide more information related to your query and please advise what error message are you getting when trying to enable the service?

Please also provide a screenshot of the error.

These details will help us properly understand the situation you are facing and allow us to offer the support you need.

[legallyrupear]

Thanks for the response!
So as you can see, on the first picture on messages 》settings, there's a notice at chat settings. Tap on same give you the second screenshot that is register for chat service, and the third screen shot state at the bottom that the registration fails! That's the error am getting. Now when I change my default messaging to Google messages, when enabling chat features, it's stuck in trying to verify my number.