Oauth credentials stop working intermittently

[martina-equinix]

Describe the bug

I have one pagerduty account configured through scoped oauth credentials and I am noticing that these credentials stop working after some time until I restart the backstage backend.

Initially, it can fetch services via the pagerduty.com/service-id annotation but after a day or two, when I visit the same component I get Missing or invalid PagerDuty Token and a 401 error with the following message:

{
    "errors": [
        "Failed to get service. Caller did not supply credentials or did not provide the correct credentials."
    ]
}

When I see this, if I just restart Backstage it starts working again with no issues.

The configuration I am using is:

pagerDuty:
  oauth:
    clientId: ${PD_CLIENT_ID}
    clientSecret: ${PD_CLIENT_SECRET}
    subDomain: ${PD_ACCOUNT_SUBDOMAIN} # just the subdomain part as stated in the docs

Expected behavior
The pagerduty integration works continuously without having to restart the backend.

Screenshots

versions

@pagerduty/backstage-plugin-backend: 0.9.1
@pagerduty/backstage-plugin-common: 0.2.1
@pagerduty/backstage-plugin: 0.15.1

backstage version: "1.31.1"

Additional context

[tfhartmann]

I'm also having the same issue