Ok! Took a look at it.

- It must all be lower-case (part of bech32 spec)

- It must NOT start with "lightning:" - this is done so the individual clients can handle this on their own. "lightning:" like "http:" - a "URI Scheme". In this field, however, you only want "lnurl1..." - no "lightning:" before that, and everything lowercase.

Therefore, this should work:

lnurl1dp68gurn8ghj7ampd3kx2ar0veekzar0wd5xjtnrdakj7tnhv4kxctttdehhwm30d3h82unvwqhhgun4wd68jcm0d4nx7un58quq8vas75

I also looked at the contents. After all, this string just hides some data and the result is: https://walletofsatoshi.com/.well-known/lnurlp/trustycomfort88

That's awesome! Instead of this lnurl stuff, instead all you have to add as your LN Address is: trustycomfort88@walletofsatoshi.com and you are good to go!

So, try adding this E-Mail looking address into your profile instead!