Numbers on iPad does not update stock prices anymore

Numbers on iPad says there is no data available for the requested symbol, when using the ‘stock’ function.

I use the stock() function, followed by the ticker symbol and a specific attribute to fetch information such as the previous day's closing price, high, or low for that stock.

It worked for more than a year, but since yesterday half of my spreadsheet is filled with red triangles with exclamation marks instead of numbers. Internet connectivity is more than okay; writing this with my iPad. Followed many suggestions to be found on the internet, but with no effect.