The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/setup-dotnet@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Detected Razor language version downgrade. This is typically caused by a reference to the Microsoft.AspNetCore.Razor.Design package. Consider removing this package reference.

Cannot convert null literal to non-nullable reference type.

Possible null reference return.

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'title' in 'Attachment SampleResponseProvider.GetThumbnailCardAttachment(string title, string subTitle, string text, string attribution, string[] images, string[] buttons)'.

Possible null reference argument for parameter 'subTitle' in 'Attachment SampleResponseProvider.GetThumbnailCardAttachment(string title, string subTitle, string text, string attribution, string[] images, string[] buttons)'.

Possible null reference argument for parameter 'text' in 'Attachment SampleResponseProvider.GetThumbnailCardAttachment(string title, string subTitle, string text, string attribution, string[] images, string[] buttons)'.

Possible null reference argument for parameter 'attribution' in 'Attachment SampleResponseProvider.GetThumbnailCardAttachment(string title, string subTitle, string text, string attribution, string[] images, string[] buttons)'.

Possible null reference argument for parameter 'images' in 'Attachment SampleResponseProvider.GetThumbnailCardAttachment(string title, string subTitle, string text, string attribution, string[] images, string[] buttons)'.