Forgot the mail I used to get my License keys

Which product are you using?
PDF.js Express Viewer

PDF.js Express Version
8.7.4

Detailed description of issue
I forgot the account I used to get the viewer license for my domain. It has been running for almost a year and now I need to make some changes to it.

Expected behaviour
NA

Does your issue happen with every document, or just one?
NA

Link to document
NA

Code snippet
NA