This is the most damaging mistake, because the errors are public. The NCSC says AI tools can 'hallucinate' incorrect facts, can be biased and are often gullible when given leading questions. Google's own help pages warn that Gemini features may suggest inaccurate or inappropriate information.
Your business is still responsible for what goes out in its name. So for anything customer-facing, such as review replies, emails, quotes or social posts, start with a person reading and approving every message. Once you've seen weeks of good results, you can relax the checks on the simplest, lowest-risk messages.
A useful test: if you'd be embarrassed to see a message screenshotted and shared, a person should approve it before it's sent.