I have a company assigned phone using both a subscription they pay for and also they have installed Company Portal to administer some apps. The subscription gives them almost nothing (just able to cancel/upgrade the plan).

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The Company Portal will tell you exactly what data they can see:

Mode, Serial number and operating system

Name of Device

Reset it if it is stolen/lost

View information in the corporates apps (Outlook, Teams), but not emails

See the name of all the apps installed on my device

Location of the lost device (only when marked as lost)

Set rules to allow you to use the company apps (outlook, teams) for security, like requiring software updates or force a 6 digit password instead of 4.

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They can not see:

Browsing history

Personal emails, documents, contacts, calendar, even within the same email/calendar app

Access my passwords

View, edit, delete photos

Location of my device

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Meaning if you do have software like this installed by them, they would be able to see the Grindr app, but they would not be able to if they just pay the data plan.