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Answer

The licence screen says "Not activated on this site"

Updated NimbleCache 1.7.0Tested with WordPress 7.1

Your key is fine — this site simply is not one of the sites using it. That normally means it was freed from another site's licence screen, or removed from your account. Press Activate licence to put this site back on, if the licence has room.

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NimbleCache

Serve your pages before the plugins load — and never touch a setting to do it.

From $19 a year · every feature · 30-day refund

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The NimbleCache dashboard in WordPress admin. A green notice reads The cache is on and pages are served before WordPress loads. Four cards show 11 pages cached (2 MB), an average build of 229 ms, a 12 hour page lifetime and preloading off. A Fast Path panel ticks off advanced-cache.php installed and current, WP_CACHE switched on in wp-config.php, the cache directory writable and compressed pages. An Exclusions panel lists what is never cached, and a Clearing Log lists recent full clears with the plugin that probably caused each.