I cannot download apps in my new device like bank app and Facebook or Instagram. When asking double click to confirm it does not start. I am using a Gmail account as apple id

Re: I cannot download apps in my new device

Wondering if you may need to sign in (to your new device) with your Apple ID

Sign in with your Apple ID - Apple Support

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Re: Is it because I am using my Gmail account as apple id?

Only if you have recently changed your Apple ID or password

Eg: What to do after you change your Apple ID or password - Apple Support

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If needed: Apple Support's article:

What to do: If you can’t download or update apps on your iPhone or iPad – Apple Support

or

The App Store Support has a website online.

There is a "Get Support" link at the bottom:

App Store - Official Apple Support

All the best :-)