I want to mention that no company has access to this currency.
I know the test company Fabricam had access but this company was deleted.
Does anyone know what would be causing this erroneous message?
Thank you.

I want to mention that no company has access to this currency.
I know the test company Fabricam had access but this company was deleted.
Does anyone know what would be causing this erroneous message?
Thank you.
I had a similar issue and found entries related to Fabrikam in the following tables causing issues, I deleted any entries where the company ID no longer existed and then I could delete any redundant currencies. I suggest taking a backup before just in case but I had no issues.
-- Multicurrency Exchange Table Access
DELETE FROM DYNAMICS..MC60200 WHERE CMPANYID NOT IN (select CMPANYID from DYNAMICS..SY01500)
-- Multicurrency Currency Access
DELETE FROM DYNAMICS..MC60100 WHERE CMPANYID NOT IN (select CMPANYID from DYNAMICS..SY01500)