Are you using a VPN that regularly changes your IP address? Or are your devices / browser setup to clear all caching, cookies, and other browsing info after set amounts of time or certain actions are taken? Generally speaking, if you're consistently using the same IP address or device you shouldn't have to input an MFA code more than once a month or so. Even with me clearing my browser cache and the infrequency of which I use the app for troubleshooting cases, I have to input my MFA code maybe once a month at most.
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