In any of the two cases that I told you the other users need a Power App license to be able to see the Portals/App.
If your company already have the Power Apps for Office 365 license for all the users, in that case they should be able to access and use all the apps. But in that case, you cannot use premium features, like Dataverse to store your data or some premium connectors. So, if your app uses this premium features then this is not the best option.
There are other alternatives you might consider doing:
If your company has a user who just need the access for a short time, then you could Explore Power Apps for free for 30 days, and then decide if you want to purchase a license. You can explore all the Power Apps capabilities for free by signing up for a 30-day Power Apps trial plan. Check this link for more info about it: Power Apps 30-day free trial - Power Apps | Microsoft Learn
Power Apps pay-as-you-go plan: which allows individual users to run applications (1 app or 1 portal) without any licenses via Azure subscription. You only pay for the number of users who used the app in a month. But in this case, you need to have the Azure subscription. See Preview: Pay-as-you-go plan
Common use cases with this plan: Use the pay-as-you-go plan for apps that need to be shared with a large user base with infrequent and/or unpredictable use.
Check this for more details about licenses: https://go.microsoft.com/fwlink/?linkid=2085130
If you have any other question, I'm happy to help!
Regards,
Community Support Team - Edgar Madrigal
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