How to solve the error of an expired token in Instagramer Suite?

When making a reset of your Instagramer Suite account in the General settings, you may face the error saying: "Unfortunately, your token was expired. Please get a new one":

You should take a few steps to resolve such kind of an issue:

1. Go to your Facebook Business Integrations settings: https://www.facebook.com/settings?tab=business_tools

2. Next to OAPPS Suite for Zendesk put a tick and click on "Remove":

3. Make sure that 2FA is enabled for the user who connects the pages. It is necessary only if 2FA is also enabled on the business account.

4. Go to Zendesk Admin Center -> Apps and Integrations -> Channel apps -> Instagramer Suite -> Open your current account  -> Continue with Facebook -> Provide all permissions.

5. Save the account settings form.

Note: It is also recommended to connect pages from the administrator of these Facebook pages.