@pasqualerose – I sorted my problem with this answer that I found in another topic:
Plugin Supportamboutwe (@amboutwe)
1 year, 4 months ago
The SEO keyword analysis can be disabled site wide or per user. So lets confirm its enabled for your site and for your user specifically:
Admin > SEO > Dashboard > Features: Is the keyword analysis feature enabled?
Admin > Users > Your Profile: Is the SEO analysis feature UNchecked?
If both of these are enabled, then something is either conflicting or has manually disabled the feature. The next step would be to disable all plugins and switch to a freshly installed default theme, like Twenty Seventeen. From this default state, enable Yoast SEO and see if the analysis returns.