Red banner for unsupported OS in Central appearing every few minutes

Since the weekend I'm seeing regular red banners listing unsupported OS in Central. I do have a handful of these Win7, 2008 etc so expect to see these alerts when I login to Central first time each day. However, even though I dismiss these banners they now appear again every few minutes, I'm unable to dismiss them permanently for that session it seems!

Have tried Firefox & Edge but these banners keep appearing. Purged Cache but made no difference, the banners keep appearing every few minutes.

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[edited by: GlennSen at 2:59 AM (GMT -7) on 15 Apr 2022]
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