Unable to Link B2C Setup

Question

I have created a B2C tenant with the "Create a resource" in our Azure portal and then I have tried to link this B2C tenant with my existing tenant and I cannot see the tenant link, it just comes up "No Available Items"

I noticed that some people say both tenants need to be on the same subscriptions but I am unsure as we have an Education tenant and it currently says our entra license is a P2 but if I look at the B2C tenant it's on a P1 free license. To sign up I had to create a new subscription as I could not see another subscription but I don't want to change the subscription of our main tenant if it means we will lose the P2 status?

Not sure if the subscription is related also it appears that I am the only one who can see the B2C tenant and other admins on our tenant are unable to switch or see it. I assume this may not be seen until I am able to link?

Does anyone have any suggestions as to what I have to do to correctly link the tenants?

Thanks