How to solve - “Base currency is not set up”

Description
The company does not have a base currency configured for POS365.

Answer
In Business Central, confirm that the currency exists and has its exchange rate, denominations, rounding, cash drawer account and bank account configured. Make sure to enable On POS for the currency.

Then open the company in the Admin Center and select the standard or local currency in the Currency field.

Indepth guide link: "Create and set up a new company in the Admin Center"