@DutyBound I recall seeing that error in the past, but it was unrelated to my internet service provider (T-Mobile). Here is a video on the topic. 

Hopefully this helps.

Thanks @copz1998 ,

But this leads to the same problem.  When I go to the restricted mode toggle switch, it says it’s activated, but it won’t give me the option of shutting it off.  Says my network administrator has turned it on.

Well, I AM the network admin.  No one else has access to my channel but me.

Here’s the prompt:

Restricted Mode

Turned on by your network administrator to help hide potentially mature videos.

ACTIVATE RESTRICTED MODE  (ON)

I haven’t turned anything on, nor will it allow me to shut it off.  I have no reason to restrict content on anything I view.  No kids around, anywhere.  Something is defaulting this to restricted, and it never happened before getting t-mobile Home Internet.

Seems to be a Youtube issue, but as shown above, it’s blaming the DNS restrictions.  What are DNS restrictions?

After doing deeper research, this is CLEARLY a problem with TMHI.  The system is set to restrict content, just as with a public admin of a library, school, or similar public access system.

I’ll be canceling this service if this isn’t resolved.  I don’t need ‘mama admin’ deciding what I can and can’t view online.  I’m paying for access, not filtering.

For example, I can’t even read comments on any Youtube video.  Nor can I post.  

I can see on Youtube where some state they are restricted with their cell phone access but not home wifi, using the same phone.  TM is clearly defaulting to restrict access.

I had the exact same problem last year.  I cannot remember how it got solved, but the restrict mode on Youtube was greyed out, so I could not turn it off.

There was a previous thread about this issue:

Maybe check your WebGuard service?

https://www.t-mobile.com/support/plans-features/web-guard-device-content-filter

I just installed a: NOK 5G21 Gateway today from T-Mobile and I have the same issue YouTube video and comments restricted somehow through the gateway itself. Even tried a factory reset to eliminate the problem so far no luck may have to return this unit if no fix can be made. 

I’m just posting as this may be of help.  I had the exact same issue as described.  I’m a system admin by trade so, I was looking to fix this on my own.  However, there is no way to fix this on your own.

T-mobiles’ 5G router by default has productivity filtering turned on.  There is not option for you to turn this off yourself.

I called T-mobile technical support.  Let them know the issue, and they turned off this filter for me and resolved my issue.  The typical customer service rep may not be able to help you with this, however technical support should  be able to.

I seem to be a year late as I just purchased the router today.  But hopefully this helps someone in the future.

First, let me thank you for this post cause it’s saved me a lot of confusion.

Since getting my T-Mobile Home Internet in August (its now October) this has happened to me 3 times, the most recent while I was in the middle of watching a YouTube video that became restricted. Every time I try to just handle it over their text support but they end up calling me and I have go through like 3 members of their support team and explain what the issue is and that its not something I can fix myself. I’m pretty tired of having to go through this. I will probably just get a different internet provider if it happens again

If you are using an ad blocker.  This could be why.  Have you tried changing the DNS on your device to something like Quad9 to see if that resolves it?