Two years ago, the company allowed users to choose third-party email apps and web browsers as their default system. This meant that if one clicked a link in a message, it would open in Google Chrome instead of safari. When one wants to click on an email address, the message will open in Microsoft outlook and not in Apple Mail. 
https://businessupside.com/2022/05/09/apple-prevents-its-tap-to-pay-feature-to-third-party-apps-for-revenue-security-factors/