It makes me think of an old blockchain.com wallet identifier... Not sure if the format is 100% correct tough, but those groupings with dashes in between bring back those memorys...
Back then, it was blockchain.info. I have a wallet identifier like this: 12345678-1234-1234-1234-1234567890ab (I've only counted the characters between the dashes, it has both numbers and lower-case characters (hex). OP's string looks different.Just in case: I used to access the wallet through this URL: https://blockchain.info/wallet/12345678-1234-1234-1234-1234567890ab, which doesn't exist anymore. But with this wallet identifier and my password I can still login to blockchain.com. I've never used the wallet to receive anything, so I can't verify if it's really still the same.