Features of survey creation that don't behave as expected or intended are described below, as well as any potential solutions or workarounds.
To report or learn more about bugs in Survey123, visit Support.
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Form creation and publishing
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My link to open a Survey123 survey and populate the contents of a numerical question is not working when opened from ArcGIS Field Maps on Android using some non-English European locales.
On Android, a space within a URL will cause the URL to become truncated at that point. In locales that use a space as a thousands separator for large numbers, such as French, Swedish, German, and Danish, this can cause a failure to launch Survey123 when a large number is included in the launch URL.
Avoid this issue by disabling the thousands separator for that web map. Open the web map in ArcGIS Online, open Configure Attributes in the Configure Pop-up pane, and disable the Use 1000 Separator format option.
Form creation and publishing
HTML formatting in my survey that worked in a previous release of Survey123 is no longer functioning.
Starting from Survey123 version 3.13, Survey123 matches the same HTML standard as ArcGIS Online. This standard is based on HTML5, meaning that tags such as center are no longer supported and will not function. For a list of supported HTML tags, see Style a survey.