In order to validate twitter site we whitelisted twitter_summary_card against one of our dev subdomain (say abc.manutd.com). At that time we used a twitter handle which was different from @Manutd (Manchester United Twitter Handle).
But after that we have been trying to whitelist the card at beta.manutd.com against @manutd handle, card validator page won’t even allow us to whitelist the new subdomain.
An attempt to test the page shows the following:
INFO: Page fetched successfully
WARN: No metatags found
Though it has all the required tags present in the html source:twitter:description
1.All the tags are present on the page.
2. ‘Summary_large_image’ and fallback go tags are present too.
3. Executed twitterbot curl and could see all the tags there too.
4. Tags are delivered from the server and not added at the client side.
5. Rest of the debug steps also yielded no result.