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accessTokenExpires in "account" is always "null" despite the response

See original GitHub issue

Your question Why accessTokenExpires may be always null? Even when there’s a clearly stated expires_in in response and exp in token?

What are you trying to do I’m using custom oAuth provider.

On token request I get response like this:

{
    "access_token": <id_token_here>,
    "refresh_token": <refresh_token_here>,
    "id_token": <id_token_here>,
    "token_type": "Bearer",
    "expires_in": 7199
}

But in jwt-callback in account parameter I always get this:

{
    provider: <provider>,
    type: 'oauth',
    id: <id>,
    refreshToken: <refresh_token>,
    accessToken: <access_token>,
    accessTokenExpires: null
 }

Question is: why?

Sadly I can’t provide a repo for reproduction due to privacy policy. Nevertheless, count on your support!

My nextauth config:

{
  providers: [
    {
      id: <provider_id>,
      name: <provider_name>,
      type: 'oauth',
      version: '2.0',
      scope: 'profile openid email',
      params: { grant_type: 'authorization_code' },
      accessTokenUrl: getAccessTokenUrl,
      requestTokenUrl: getAccessTokenUrl,
      authorizationUrl: `${getAccessCodeUrl}?response_type=code`,
      profileUrl: getProfileUtl,
      profile: async (profile) => {
        return {
          id: profile.uid,
          role: profile.role,
          name: profile.displayName,
          email: profile.mail
        };
      },
      clientId: CLIENT_ID,
      clientSecret: CLIENT_SECRET
    }
  ],
  pages: {
    signIn: '/auth'
  },
  events: {},
  callbacks: {
    session: async (_session, token) => {
      return { ...token };
    },
    jwt: async (token, user, account, profile) => {
      if (account && user) {
        return {
          accessToken: account.accessToken,
          accessTokenExpires: Date.now() + account.expires_in * 1000,
          refreshToken: account.refreshToken
        };
      }

      if (Date.now() < token.accessTokenExpires || !token.accessTokenExpires) return token;

      return refreshAccessToken(token);
    }
  }
};

Feedback Documentation refers to searching through online documentation, code comments and issue history. The example project refers to next-auth-example.