What kind of hash/encryption is this? (Extracted Message Data from Iphone)

_dXgqa-ZRyQ0RPTlAdBhEmzFXNMyQW9RmMu-XBCI

This is an encoded contact name from the LINE messenger app extracted from an iphone. I don't have the pre-encoded data. I've tried some base64 but with no success.

Can anyone tell the kind of encoding by sight, or have any advice on how to go about finding out?

Appreciate any help anyone can give! Thanks