iphone mail and accented chars

Hello,

Managing a website which sends email order details to customers/shop owners, I recently realized that the accented chars (French) are not properly displayed/rendered on my iPhone using the latest iOS 16.1.2

I don't recall when this started happening but it used to be rendering normally not so long ago.

Tried to include <meta http-equiv='content-type' content='text/html;' charset='UTF-8'>" in my email message with no luck... Changed it to iso-8859-1: same results...

• Verified that within a browser the message displays ok, and it does..
• Verified in gmail/outlook etc...and message is also displayed correctly

Is there anything new that would need to be done in order to display the message with accents?

Thanks