We have had troubles updating site icons in SharePoint Online. It might be related to one of the following: It occures only on hub sites The sites have a custom theme The error message: We experienced a problem updating the icon. Please try again in a few minutes. But what I found is that there are two places where you change the site icon. If the first does not work, try the second one, that was what worked for us:

While trying to set up a new Home Site, I discovered that there is a tool (browser extension) called Page Diagnostics for SharePoint. After running this, I tried that command again and it was smart enough to detect the problem the tool discovered. Also Network Trace is available. Network trace Page Diagnostics Tool is defnitely a tool to have in the troubleshooting toolbelt for SharePoint. Setting up a Home Site Here is the script:

This is my personal list of links and thoughts on troubleshooting performance in SharePoint Online. Resources @MSFT365Status, a twitter flow on the incidents and resolutions connectivity service Service Status (open for all), Service Health (for admins) Health info in Response Headers Every response from SharePoint Online contains some health information: Diagnosing performance issues with SharePoint Online (MSDocs) Troubleshooting SharePoint Performance Issues with F12 (blog post) Following Response Headers could reveal the health:

I troubleshooted a piece of CSOM code in SharePoint 2013. I got the following error: Method “GetList” does not exist The reason was that the method GetList was not imlemented until March 2015 CU (15.0.4701.1001), and the SharePoint farm I had was SharePoint 2013 SP1 (15.0.4569.1000). So the solution is to install the Cumulative Update or use web.Lists.GetByTitle. GetByTitle has one aweful shortcoming: it doesn’t work in multilingual environments. So I have recommended to install the March 2015 CU.