It can work using push notifications - but don't do it.
Every time a user roams from one AP to another, they'll get a prompt. Every time they walk in and out of coverage, they'll get a prompt. If their NIC powers down to save power and then comes back online, they'll get a prompt.
Users will get lots and lots of push notifications.
If you need tight security, use certificates instead. If you have active directory, you can use the built-in CA server (to issue certificates) and NPS (as the RADIUS server).
https://documentation.meraki.com/MR/Encryption_and_Authentication/Configuring_RADIUS_Authentication_...
It's a step learning curve if you have not done it before. I'd get someone to come in and set it up for you.