One can reproduce the problem.
Create new Spreadsheet.
Take SpreadsheetId (https://docs.google.com/spreadsheets/d/1rp11nqj0t0x1111111111111111111111111137Wj4XU/edit#gid=0, here it is 1rp11nqj0t0x1111111111111111111111111137Wj4XU)
Fill range A1:F15 with any content, let's use 'lorem ipsum' string, for instance.
Visit https://developers.google.com/sheets/api/reference/rest/v4/spreadsheets/batchUpdate 4.1 Look at right side where one can find "Try this method" 4.2 Fill field "spreadsheetId" with one you've taken on step 2. 4.3 Fill "Request body" with
{ "requests": [ { "repeatCell": { "cell": { "userEnteredFormat": { "textFormat": { "strikethrough": true } } }, "fields": "*", "range": { "startRowIndex": 2, "endRowIndex": 2, "startColumnIndex": 1, "endColumnIndex": 3 } } } ] }
4.4 Press "Execute" button at the bottom of right side. 5. Check you spreadshet. 6. No error, nothing happened.
What am I doing wrong ?