Is it possible to stop getting old subscription requests that have already been received? Usually what happens when a user logs in now any subscriptions pending is usually received at the time of login.
See Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and Presence RFC 6121 3.1.3 4.
Otherwise, if the contact has no available resources when the subscription request is received by the contact’s server, then the contact’s server MUST keep a record of the complete presence stanza comprising the subscription request, including any extended content contained therein (see Section 8.4 of [XMPP‑CORE]), and then deliver the request when the contact next has an available resource. The contact’s server MUST continue to deliver the subscription request whenever the contact creates an available resource, until the contact either approves or denies the request
Thanks for just pointing that out for me hehe it does make sense after all considerations.