Zoho one app - usage with ios

how many apple devises have access to the zoho one app and if not why not - for my ipad and apple air and phone can i use an app for all 3 and if not why not

All your users should be able go login anywhere. There shouldn’t be a limit @ncorept
Are you seeing something that tells you you’re limited?
Or maybe you can only login as admin on 1 device at a time?