Can you confirm your EE connection plan? You mentioned only 100M down, but 1000M up. I ran into a similar issue before, but was mainly due to duplex mismatch between MX and ISP. However, even when the duplex issue was fixed, the MX still could not get the max speed due to the shaping. IE: we got MX84 with a EE 800M service, but shaping on dashboard only support up to 500M. Not sure if it is possible to disable uplink shaping in dashboard.
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