Please check whether the sandbox flag is displayed correctly using the following command.
codesign -d --entitlements :- /Applications/Bandizip365.app/Contents/PlugIns/Bandizip365FinderSyncExtension.appex
As mentioned above, <key>com.apple.security.app-sandbox</key><true/> must be present for it to be properly configured.
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "
https://www.apple.com/DTDs/PropertyList-1.0.dtd"><plist version="1.0"><dict><key>com.apple.application-identifier</key><string>4S9C2A4BKK.com.bandisoft.mac.bandizip365.findersyncextension</string><key>com.apple.developer.team-identifier</key><string>4S9C2A4BKK</string><key>com.apple.security.app-sandbox</key><true/><key>com.apple.security.application-groups</key><array><string>4S9C2A4BKK.group.com.bandisoft.mac.bandizip365</string></array><key>com.apple.security.files.user-selected.read-only</key><true/></dict></plist>
If you see anything different, the app might be corrupted. In that case, please delete the app, download it again from the App Store, and follow the instructions in the help link below to set it up.
https://www.bandisoft.com/bandizip.mac/help/finder-extension-sequoia/Thank you for your feedback.