Cookie banner not showing with GTM

Hello,

I have a problem with the cookie banner, it doesn’t display at all.

I filled in both fields in the admin for the GTM code :
– Add an additional tracking code (like Facebook Pixel, Hotjar…)
– [BODY] Add an additional tracking code (like Google Tag Manager…)

I clicked on the button: “Request user consent for statistical tracking (required for RGPD)”.

I added the code : <?php wp_body_open(); ?> just after the body.

Despite this, nothing is displayed in the source code, and I also tested it in private browsing.

To test the GTM code provided by the client, I added the code in the page, the banner is displayed well, but if I click the banner returns to each page.

Thanks to you to enlighten me.
I’m in version : 4.0.3