text message not appearing on mac for only one contact

But I am Still not getting OTP from one provider only, repeatedly

Me and My brother both have a profile on Matrimonial site called readymatrimony.com

he is getting all the OTP and login information on his android phone while I am not even able to get forgot password OTP on my iphone 11. If the website or the SMS APi would have issue , it should be on both .

I need to insert my SIM card in some another phone to get OTP

That one contact has incorrect data for your iPhone ... wrong phone number.