I had something similar recently: a few years ago got promoted into a new position and during the discussion it was mentioned that the expectation was for this

I had something similar recently: a few years ago got promoted into a new position and during the discussion it was mentioned that the expectation was for this role to receive x% of annual bonus. Didn't get it first year,then covid hit and I was happy to keep the job and then next year it didn't happen again. I mentioned it and it got fixed next month. If the company refuses to recognise it, I'd seek alternative employment.