SharePoint Designer Error – Unexpected error on server associating the workflow

I was working on few 2010 reusable workflows in SharePoint Online and I was not able to publish them. I was receiving below error:

I searched for the google and was not able to find anything until I found the blog in reference below. It suggested to check in admin center that if I got any message saying that the service is going to update and it was there.

It stated that the service may be affected till 7th November 2019. In case you are facing same issue wait for the update complete.

Reference -

• https://social.technet.microsoft.com/Forums/en-US/c4fb5728-bdff-4482-adb6-2a28213fd30e/unexpected-error-on-server-associating-the-workflow-sharepoint-online?forum=onlineservicessharepoint