Appspace unsuccessfully updating on BrightSign devices

Hello all, I’m trying to update the Appspace app on our BrightSign players from 2.98.0 to 2.99.0 using the Appspace scheduled update feature. What I’m finding is that some of them do so without issue, whereas others will not update at all. If I look on one of the problematic device’s SD cards, I can read it’s “package-update-info.json” file, which says:

..."status":"update-info-not-found","updateUrl":"https://cloud.appspace.com/device/brightsign/2.99.0"

Similarly, in the device’s log, I get:

[   15.889] + APPSPACE|app-update: Initializing app update process
[   15.892] + APPSPACE|common-utils.brs: Showing message on screen: Checking for app update
[   15.895] + APPSPACE|app-update: GetUpdateInfo from https://cloud.appspace.com/device/brightsign/2.99.0
[   15.895] + APPSPACE|app-update: Downloading https://cloud.appspace.com/device/brightsign/2.99.0/app-package.json
[   15.895] + APPSPACE|common-utils.brs: HttpGetAsString from https://cloud.appspace.com/device/brightsign/2.99.0/app-package.json
[   15.897] + APPSPACE|common-utils.brs: HttpGetAsString result 
[   15.898] + APPSPACE|app-update: Invalid downloadResult
[   15.898] + APPSPACE|app-update: SavePackageUpdateInfo with status update-info-not-found
[   15.898] + APPSPACE|app-update: No app update available
[   15.898] + APPSPACE|autorun.brs: No app update available

I take it that this indicates some sort of issue acquiring information/files for the new update from the Appspace website. Does anyone have any idea how to correct this?