Try adding process id to exim get-token credential cache
drwxr-xr-x - conf.d
lrwxrwxrwx 18 email-addresses -> ../email-addresses
-rwxr-xr-x 629 get-token
-rw-r--r-- 56 local_domains.cfg
-rw-r--r-- 1181 update-exim4.conf.conf