Change Add-in client secret

You can run the following script from the installation folder to check the client secret expiration date of your Add-in:

./beezy-GetAddinExpirationDate.ps1

You’ll be prompted for the O365 tenant credentials and the output will contain the Beezy Add-in (Principal Name: Beezy) and the EndDate that is the expiration date of the Add-in Client Secret.

If you need to replace the expiring client secret execute the following script:

./beezy-ReplaceAddinExpiringClientSecret.ps1

1. You’ll be prompted for the O365 tenant credentials
2. Save the client secret generated by the script
3. In your Azure app service that hosts Beezy > Application settings > App settings (*)
   1. Add key “SecondaryClientSecret” with value <your old client secret>
   2. Modify key “ClientSecret” with the client secret generated by this script

(*) If you are using an Azure Key Vault to save your Beezy client secret you just have to update these values there.

Source: https://msdn.microsoft.com/en-us/library/office/dn726681.aspx

As stated in previous guide, you need to wait at least 24 hours to propagate ClientSecret to SharePoint Office (SPO).