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I had a similar problem but while using google cloud storage. The solution for me was to set those specific files as public. Google cloud storage enables one to make data public in a bucket selectively, i.e per object level
for google cloud storage, i followed this https://cloud.google.com/storage/docs/access-control/making-data-public
The sad part is that i have to do this iteratively for every file that is linked to by a relative url within a css file. It is tiresome but will get the job done and maintain required privacy
here is a link to the solution in google cloud storage https://cloudworks.dukamneti.co.ke/fonts-failed-load-resource-google-cloud-storage/#contact
๐คHenry Kuria
Source:stackexchange.com