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Before anything else
Likely causes
Google says customers who use older phones or software might have trouble when they try to leave reviews.
Fix Update Google Maps to the latest version and try again.
Source: About missing or delayed reviews — Google Business Profile Help, checked
Google says it might temporarily disable user-created content, including reviews, for certain Business Profiles or business categories to protect business owners.
Fix Wait. It is a temporary state that only Google can lift.
Source: About missing or delayed reviews — Google Business Profile Help, checked
Google says that while a profile is suspended the public cannot go to it.
Fix Nothing to do from your side. There is no public profile to review until the owner gets it reinstated.
Source: Fix suspended or disabled profiles — Google Business Profile Help, checked
Google says reviews are available only in certain countries or regions and for certain business categories.
Fix Nothing to do. No one can review that business while it sits in that category or region.
Source: Manage customer reviews — Google Business Profile Help, checked
Google says reviews and ratings are removed and disabled for Business Profiles primarily categorised as educational institutions for students aged 6 to 18.
Fix Nothing to do. Reviews are permanently off for those profiles.
Source: About missing or delayed reviews — Google Business Profile Help, checked
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Questions
Usually because reviews are not available for that business's category or region, or Google has temporarily turned user content off for the profile.
Yes. Reviews are tied to a Google account, which is also why they appear on your own contributions page.
No. The reasons Google documents are its own: category and region availability, and user content it disables temporarily.
Sources