You have been invited to a band

This link is meant to be opened on the phone bandcue is installed on. When it is, Android hands it straight to the app, and there is nothing to do here.

If you are reading this page instead, that is normal in a few cases, and none of them is a problem:

you opened the mail on a computer, or on a phone without bandcue;
bandcue is installed but Android has not yet verified that this site and the app belong together, which it does in the background after an install;
somebody sent you this page’s address rather than the link from the invitation mail.

Don't have bandcue yet? Install it, sign in with the address the invitation was sent to, and open this link again — the invitation waits. Nothing expires and nobody is told whether you opened it.

Opening this page, or the button above, does not join anybody’s band by itself. bandcue asks you to confirm, signed in with the address the invitation was sent to, before you are added.

The part of the link after the # never leaves your browser: a fragment is not sent to a server, so it appears in no log here or anywhere in between. This page reads it only to build the button above, on the device you opened it on.