2nd IPhone-Family Sharing / cannot link to yahoo calendar

[Crew4752]

I purchased your calendar several days ago and it connected automatically to my yahoo calendar. Everything is now on your calendar from Yahoo.

The problem I’m having is my second phone.

I installed the app on my second iPhone but it’s not finding the yahoo calendar. My yahoo email & calendar are used on this phone, the only difference is the apple sign in is different.

Of course I’m using it under family sharing since I own both phones.

What can I do to have the second calendar link into the Yahoo account?

I don’t see an area in which I can manually enter the information

Thanks

Michael