Group members cannot talk to each other, or this repeater cannot communicate with a radio.

Analysis
1,TX/RX frequency of the repeater is inconsistent with that of portable/mobile radios.
2, The repeater failed to repeat useful signal due to strong interference signal.
3,The group member is out of the coverage of the repeater.
Solution
1, Check if the frequencies are consistent. Reset them when necessary.
2, If you cannot remove or bypass the interference source, change to operate at other frequencies.
3, Go within the coverage of the repeater.