As documented in Calling Atlassian app APIs from a remote, there's not endpoint currently available to refresh access token for Forge Remote.

Apps currently need to rely on scheduledTriggers to received access tokens periodically. However, in the case of an incident/issue where scheduled Triggers fails, Forge remotes are left without a valid access token and app functionality breaks.

To address this, please implement an endpoint or mechanism where Forge Remotes can proactively request an access token.