Hi Hallet,
we found the solution (many thanks to DavidLewis Yammer , and benlu01)
There's this in IntroscopeEnterpriseManager.properties (10.7 at least)
###############################################################################
# ACC Connection Configuration
###############################################################################
# Command Center URL used for navigating to Command Center from the ATC UI main
# navigation. Link will be hidden if URL value is empty. Default value is empty.
# It's also URL that points to the root of the ACC REST API
#introscope.appmap.acc.rest.base=http://acc_host:acc_port/apm/acc
solution:
introscope.appmap.acc.rest.base=http://acc_host:acc_port/apm/acc
Regards,
Marco