FACEBOOK Question - making someone an admin

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So I am an admin on a page say called X and have joined a few local FB Groups as this X.

I have now been made an admin on another page will call this Y and need to join the same groups as X.

But when I go onto these groups it doesnt give me the option to join, also I cant "switch" to the Y

Any ideas? Has Y set me up correctly???

Any ideas

Anyone?

I can’t see how to do it currently as the options aren’t coming up, but this May or may not help:

m.facebook.com/help/iphone-app/215443548960829

It is to do with which identity you are currently ‘interacting’ as.
It may depend on whether you are on a computer, app, on a mobile browser or on a mobile switched to ‘view as mobile’/ ‘desktop view’

Still struggling with this. Ive asked the page creator to join the groups then see if I can post on them

I don't understand the OP

Are X and Y people or groups?

X and Y are business pages

Is this one of those mental maths problems? Pretty sure DD had this question in her homework today