Roman Name and Katakana Name don’t match

I've been trying to move some money from my JP Post account to my PayPay account but the verification thinks that the katakana of my name doesn't match my name on my MyNumber card.

I even got a Japanese friend to write my name in as I thought I was typing it wrong, but it still came back as not a match.

I'm now thinking that it's due to my name not being in English. The pronunciation of the katakana doesn't match the pronunciation of the roman spelling, my non English name, which obviously doesn't follow English phonetics.

For example, if my name was spelled Méadhbh on the MyNumber card, the katakana pronunciation would be メーブ. (Not my real name but same language). But this wouldn't match the pronunciation in English.

I'm not certain that's the reason, but it's the only reason I can think of as of right now.

Are there any other foreigners with non English names who managed to get verified on PayPay? Should I change the katakana to the incorrect version of my name? How do I know what PayPay considers the correct pronunciation?

I'd really appreciate any help, as I really need online banking and PayPay seemed like the easiest option.