Hello,
It seems like admin user password cannot be changed on PMM Server version 2.26.0 (container image version).
It still looks like the password would be changed:
podman exec -t pmm-ncas bash -c 'ln -s /srv/grafana /usr/share/grafana/data; grafana-cli --homepath /usr/share/grafana admin reset-admin-password xyz'
"stdout": "\u001b[32mINFO\u001b[0m[02-14|07:25:47] Connecting to DB \u001b[32mlogger\u001b[0m=sqlstore \u001b[32mdbtype\u001b[0m=sqlite3\r\n\u001b[32mINFO\u001b[0m[02-14|07:25:47] Starting DB migrations \u001b[32mlogger\u001b[0m=migrator\r\n\u001b[32mINFO\u001b[0m[02-14|07:25:47] migrations completed \u001b[32mlogger\u001b[0m=migrator \u001b[32mperformed\u001b[0m=0 \u001b[32mskipped\u001b[0m=279 \u001b[32mduration\u001b[0m=642.75µs\r\n\r\nAdmin password changed successfully \u001b[32m✔\u001b[0m",
"stdout_lines": [
"\u001b[32mINFO\u001b[0m[02-14|07:25:47] Connecting to DB \u001b[32mlogger\u001b[0m=sqlstore \u001b[32mdbtype\u001b[0m=sqlite3",
"\u001b[32mINFO\u001b[0m[02-14|07:25:47] Starting DB migrations \u001b[32mlogger\u001b[0m=migrator",
"\u001b[32mINFO\u001b[0m[02-14|07:25:47] migrations completed \u001b[32mlogger\u001b[0m=migrator \u001b[32mperformed\u001b[0m=0 \u001b[32mskipped\u001b[0m=279 \u001b[32mduration\u001b[0m=642.75µs",
"",
"Admin password changed successfully \u001b[32m✔\u001b[0m"