Policy
Stop checking for table alt text accessibility information
This policy setting prevents the Accessibility Checker from verifying that tables contain alternative text. If you enable this policy setting, the Accessibility Checker will be prevented from verifying that tables contain alternative text. If you disable or do not configure this policy setting, tables will be checked for alternative text and any issues will appear in the Accessibility Checker.
ad48bb00e93a L_StopCheckingTableAltTextAccessibilityInformation Registry
Copy registry mappings
HKCU\software\policies\microsoft\office\16.0\excel\accchecker\tablealttext (enabled) = 0
HKCU\software\policies\microsoft\office\16.0\excel\accchecker\tablealttext (disabled) = 1 Policy notes
This policy setting prevents the Accessibility Checker from verifying that tables contain alternative text. If you enable this policy setting, the Accessibility Checker will be prevented from verifying that tables contain alternative text. If you disable or do not configure this policy setting, tables will be checked for alternative text and any issues will appear in the Accessibility Checker.