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As I said, the Group Extension only works on group pages. Stop trying to use that code on other pages.

In your last example, you are calling groups_get_user_groups( bp_loggedin_user_id() ); AFTER you try to use it to gather group meta.
As I said, groups_get_user_groups() will return an array.
But you are trying to use the return value in groups_get_groupmeta which only takes a single group id.

It seems like you are trying to copy and paste various bits of code.
You should probably hire a developer.

This is my guess at what you are trying to do.

function display2() {

	$member_group_ids = groups_get_user_groups(bp_loggedin_user_id());
	
	$setting = groups_get_groupmeta( $member_group_ids[0], 'entreprise_statistiques_setting' );
	$setting2 = groups_get_groupmeta( $member_group_ids[0], 'entreprise_statistiques_setting2' );

	?>
	<div id="stats">
	<script>StatHatEmbed.render({s1: '<?php echo($setting); ?>', w: 760, h: 235, tf:'month_compare', style:'fill', title:'<?php echo($setting2); ?>'});</script>
	</div>

	<?php
	
	if ($setting == NULL) {
		echo ("Aucun site internet détecté, merci de contacter l'équipe COMMIUM.");
	
}

The BP_Group_Extension is for use within a specific group. And the group_id is ‘known’ within that context.

To show data specific to a member’s groups, anywhere on the site, use: groups_get_user_groups to get all the group ids for that member.
For example: $member_group_ids = groups_get_user_groups( bp_loggedin_user_id() );
So $member_group_ids will be an array of group ids that you can use in a custom function to gather and display group data specific to the current user.

For more info on that function and other useful group functions, see:
buddypress\bp-groups\bp-groups-functions.php

Hi @mohamedbakry83,

In this case you’ll need to copy the email template into a /buddypress/assets/email/single-bp-email.php file of your active theme and edit it from theme to include a new template tag.

something like:

<?php mohamedbakry83_output_avatar(); ?>

Then in a bp-custom.php file, you’ll need to include new function for this template tag:

function mohamedbakry83_output_avatar() {
  $token = '{{recipient.avatar}}';
  printf( '<img src="%s">', $token );
}

In this file, you’ll need to use & adapt the filter @shanebp pasted in his first reply making sure to check $formatted_tokens['friend-requests.url'] & $formatted_tokens['initiator.id'] are set and then set the recipient.avatar token like this :

$formatted_tokens['recipient.avatar'] = bp_core_fetch_avatar(
  array(
    'object'  => 'user',
    'item_id' => $formatted_tokens['initiator.id'],
    'html'    => false,
  )
);

This is for the friendship request email. But you should be able to do it for any email type with this example.

From the codex:

Add Email Token