macOS · Research guidance. Instructions are based on publisher guidance; a UK IPTV account was not tested on this platform.
Identify which app opened the link
Apple documents the Mac default browser as the application used when opening a web link. If a link from a support message opens in a different browser than expected, first check that routing preference. The new window’s appearance is not enough evidence that the viewing provider changed the account or removed a subscription.
Consider an ordinary session difference
One browser may already hold a website session while another displays the site’s sign-in page. This is an illustrative reason to inspect the actual context, not a claim that every service handles sessions identically. Opening a link in another app is not, by itself, proof that private browser information was migrated or synchronised.
Use the intended route deliberately
Check the legitimate address and decide which trusted browser context should handle the task. Apple’s documented settings location varies by macOS version, so use the installed version’s route if changing the default is appropriate. Do not repeatedly reinstall a player simply because a written help link opened outside the browser you normally use.
Keep the report specific
Name the app from which the link was opened, the browser that appeared and the exact page state. If a sign-in fails there, preserve that response separately. This gives support a reproducible routing or session question instead of a general claim that the account vanished as soon as another window opened.
Questions, answered
What does the Mac default browser preference control?
Which browser opens a web link in the documented context.
Does opening a different browser prove account data was migrated?
No. Inspect the resulting session and actual account response.