Apple Watch Series 4 vibrating notifications for the Mail app.

Hello,

So I have a plan with the bank set up in a way to receive an e-mail whenever I purchase something.. however when I receive something on my icloud email (which uses the Mail) app I get no vibrating feedback on my Watch.. and if it's on mute I would never notice anything. Every other app and every other vibrating feedback there could be is working flawlessly on the watch... Just the Mail app seems to be glitchy. Is there any workaround for this or should I just switch to gmail.. as the 3rd party app for Gmail seems to be working fine with the vibration on the Watch.