Issue in scheduling CKAD exam

I have been trying to scheduling an exam for CKAD , but I am stuck at the Mobile number verification . For verification an OTP is to be sent to the number, but after multiple tries (from different browser, devices, to different mobile numbers)I am not receiving the OTP even though it’s coming that OTP is sent.
Also tried adding +91 (as it’s an Indian number) but getting error "Phone number must be from US or Canada for verification).

I have raised a jira ticker, but I guess it will take a lot of time for them to come back. Meanwhile if someone has any pointers which I can try out, then it will be helpful. Thank you !

You should get a reply from Linux Foundation within 3 business days.