If you can see the Soapbox logo attached to your Google Calendar events, but the sidebar asks for you to sign in, you are likely being blocked by your Google Chrome security settings.
To fix this go to ⋮ > Settings > Privacy & Security > Cookies & other site data
At this stage, you will likely see that "Block 3rd party cookies" is selected. There are 2 options to fix this issue.
Change your security options to either "Block third-party cookies in incognito" or "Allow all cookies"
Hope this helps! If you have any questions, please select the help icon in the bottom right of your screen to speak with Soapbox support.