"Show Codes" not available in Two Factor Authentication section

I have 2-FA enabled and am trying to generate and view single-use backup codes.

I've tried this using several Web browsers on several machines/operating systems; in all cases "Show Codes" is not present on the page, as it apparently should be.

When I select "Get Codes", the system somehow deals with the request but, after the page refreshes, nothing else is displayed or downloaded.

I have tried switching-off 2-FA (in order to switch it back on again), but to no avail.  All that happens is that subsequent references to the Account Settings pane cause an error and 2-FA is still enforced.  After a fair amount of time has passed, that pane becomes functional again, but nothing else has changed.

I have contacted support, but so far, they have no solution.  The issue has been escalated with them.

Any ideas what the problem may be?

mrcd:

Any ideas what the problem may be?

Sorry, no ideas.  
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as test:
Two-factor authentication for your Norton account
https://support.norton.com/sp/en/us/home/current/solutions/v100023155
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after verifying phone number

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Show codes

Get New Codes

OK

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Turn off