Adding an Existing Planner to a SharePoint site

I have a Template of a Planner that I use on all SharePoint sites I create.  Usually, I go into Planner, make a copy of the Plan, rename it, and select the site on which I would like it to appear.  Then I go to the site, select Add New Plan, choose Use Existing Plan, and then from the dropdown, choose the planner that I just created.  This has worked beautifully for over a year.

Now, I do the exact same steps and when I get to Use Existing Plan, nothing appears.  This is happening on all new sites I am creating.

When I go back into Planner Hub and select the plan I am trying to link, I can get to my site from this planner so the link is there in the background.  Why is it not showing up in my options for Use Existing Plan?