Having trouble with phone number on account error code

Community Helper
@Angel65 Welcome to the OfferUp Community forum,

Angel65 If you’re still having this issue I would recommend. contacting customer care from the link below, or you can contact OfferUp through Twitter at OfferUp if this option is available to you. 😎🇬🇧🔚

OfferUp Customer care,
Level 1
It took me several times, I reset I phone two times, also signed out of offer up.
Not sure which one did the trick but I myself would have never figured it out untill looked here for help!
Level 1
Still no luck over here. He reset his phone and logged in and out a bunch. He also tried logging into his account from my phone and from his MacBook. 😑