Hi Aris,
Please currently confirm to make sure,
a. as you may have done, all the required DNS records are added correctly at the hosting provider,
b. all the related services work properly.
I would explain that the domain statuses we see at Office 365 portal are not real-time. If you can confirm that the Office 365 services are working from your side, you may ignore the indication.
You can also send the custom domian name to us, and we may try to further check its status.
To protect your privacy, please reply through the private message I have sent you at
https://community.office365.com/user/conversations.
Best Regards,
Rene