NetworkManager can't connect to PPP interface

I have a CentOS 7 server which is connected to a PPTP VPN network. That means CentOS7 is a PPTP client itself. I need to direct HTTP requests to the PPTP server, but when I click the ppp0 switch in cockpit web panel, or run 'nmcli device connect ppp0', I get this error:

Error: Failed to add/activate new connection: Device class NMDevicePpp had no complete_connection method

My system specs:

$ uname -a
Linux localhost.localdomain 3.10.0-1062.9.1.el7.x86_64 #1 SMP Fri Dec 6 15:49:49 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet scope host lo
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:2b:ba:88 brd ff:ff:ff:ff:ff:ff
    inet brd scope global noprefixroute dynamic ens33
       valid_lft 1632519sec preferred_lft 1632519sec
37: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1446 qdisc pfifo_fast state UNKNOWN group default qlen 3
    inet peer scope global ppp0
       valid_lft forever preferred_lft forever

$ ip route
default via dev ens33 proto dhcp metric 100 dev ppp0 proto kernel scope link src dev ens33 proto kernel scope link src metric 100

$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         gateway         UG    100    0        0 ens33 UH    0      0        0 ppp0   U     100    0        0 ens33

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