Unfortunately my Entra lab is no longer functional because I'm stuck in some weird loop of MSFT killing my tenant and I can't create anything new. But, when I did have it functional I had it doing SSO to my 8 Meraki test labs. I used the SSO subdomain as the entity ID so it was different for each ent app in MSFT. So lab.sso.meraki.com, lab1.sso.meraki.com, lab2.sso.meraki.com, etc. That definitely worked using the SP login pages. I believe it worked using the IdP sign on flow too. But it's been many months and I cannot recall for sure. Can you set it up like that and test it?
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