I’ve been using Tally (creating surveys) and send the input to Coda. It worked for 25 rows but now say “Failed to fetch data from Tally Forms”. I asked Tally if it was something on their side but they tried with a larger table and worked. Where could I start to debug?
I think your first point of call should be to create a new form on Tally and sync that to the same doc. If that works it confirms your connection to Tally is still working.
If that works then create a new doc, add the Tally pack and add the same broken form.
Let it sync and see how it goes. If that works then there is something wrong with the specific sync to your existing doc.