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I get the error message when trying to access member benefits on chrome edge and cellphone.

I am able to sign in and use my account normally except the membership benefits page.  

Thanks for confirming! That helps narrow things down quite a bit. Since you're able to access the rest of your account normally and have already tried multiple browsers, clearing your cache, and using incognito mode, this appears to be specific to the Xfinity Membership benefits page.

With other members reporting the same error, we'd like to look into whether there's a broader issue affecting access to Membership benefits rather than have you continue repeating troubleshooting steps.

One thing we haven't checked yet: Have you tried accessing your Membership benefits through the Xfinity app instead of a web browser? If so, are you receiving the same error there?

No I can not access through the app either, it is the same error

Good Morning, @user_b6vpah! Thank you so much for taking the time to reach out to us here on the Xfinity Forums. I am very sorry to hear about the experience with reaching the Xfinity Membership page, it certainly not what we want for our customers. Have you attempted incognito mode on the browsers?

Yes, I have tried incognito browsers as well. 

Same issue, and yes, I've tried everything suggested here.

@XfinityJeffB​ Do you mean a browser's private mode? I just did and got the same result. I check Xfinity's member rewards every week, have been for years, and considering how many others have been getting this message today, something must have changed this week on the Xfinity site.

Yes, that is exactly what I meant. We can try digging a little deeper on this for you, it may require a ticket, but we're here to help and do all we can. 

Please send us a direct message with your full name and complete service address to "Xfinity Support". To do so, click on the direct messaging icon located at the top right of this forums page.

Here's the detailed steps to direct message us: 
How to Send Us a Direct Message:
To send us a direct message:
1. Click "Sign In" (If necessary)
2. Click the "Direct Messaging" Icon.
3. Click the "Start New Conversation" (pencil and paper) icon.
4. In the “To:” line, type "Xfinity Support".
5. As you type, a drop-down list will appear. Select "Xfinity Support" from that list.
6. An "Xfinity Support" graphic will replace the "To:" line.
7. Type your message in the text area near the bottom of the window.
8. Press Enter to send it.

For an example of how to send us a Direct Message, check out this link.
How to: Direct messaging within the forum | Xfinity Community Forum