Firstly, apologies, newbie here. Just recently purchased mikrotik vpn router. Did the absolute minimum - tick vpn access in “Quick Set”, gave vpn user a password.
From my internal network I can log in to the vpn server. Works as expected.
Set up my tplink internet router - NAT Forwarding port 1723 to internal mikrotik ip with same port, all protocol. Ensure “PPTP Passthrough” is ticked.
Tried to connect from my phone - using my internal network, connected. Using my phone network (data line), connection fail.
Export config below.
What am I doing wrong? Driving me mad. 
Please help.
[admin@MikroTik] > export hide-sensitive
# oct/10/2019 15:26:22 by RouterOS 6.42.12
# software id = DMDL-IQSD
#
# model = RB750Gr3
# serial number = 8B010AEBA7E9
/interface bridge
add admin-mac=74:4D:28:A6:14:B6 auto-mac=no comment=defconf name=bridge
/interface list
add comment=defconf name=WAN
add comment=defconf name=LAN
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
/ip hotspot profile
set [ find default=yes ] html-directory=flash/hotspot
/ip pool
add name=dhcp ranges=192.168.88.10-192.168.88.254
add name=vpn ranges=192.168.89.2-192.168.89.255
/ip dhcp-server
add address-pool=dhcp disabled=no interface=bridge name=defconf
/ppp profile
set *FFFFFFFE local-address=192.168.89.1 remote-address=vpn
/interface bridge port
add bridge=bridge comment=defconf interface=ether2
add bridge=bridge comment=defconf interface=ether3
add bridge=bridge comment=defconf interface=ether4
add bridge=bridge comment=defconf interface=ether5
/ip neighbor discovery-settings
set discover-interface-list=LAN
/interface l2tp-server server
set enabled=yes use-ipsec=yes
/interface list member
add comment=defconf interface=bridge list=LAN
add comment=defconf interface=ether1 list=WAN
/interface pptp-server server
set enabled=yes
/interface sstp-server server
set default-profile=default-encryption enabled=yes
/ip address
add address=192.168.88.1/24 comment=defconf interface=ether2 network=192.168.88.0
/ip cloud
set ddns-enabled=yes
/ip dhcp-client
add comment=defconf dhcp-options=hostname,clientid disabled=no interface=ether1
/ip dhcp-server network
add address=192.168.88.0/24 comment=defconf gateway=192.168.88.1
/ip dns
set allow-remote-requests=yes
/ip dns static
add address=192.168.88.1 name=router.lan
/ip firewall filter
add action=accept chain=input comment="defconf: accept established,related,untracked" connection-state=established,related,untracked
add action=accept chain=input comment="allow IPsec NAT" dst-port=4500 protocol=udp
add action=accept chain=input comment="allow IKE" dst-port=500 protocol=udp
add action=accept chain=input comment="allow l2tp" dst-port=1701 protocol=udp
add action=accept chain=input comment="allow pptp" dst-port=1723 protocol=tcp
add action=accept chain=input comment="allow sstp" dst-port=443 protocol=tcp
add action=drop chain=input comment="defconf: drop invalid" connection-state=invalid
add action=accept chain=input comment="defconf: accept ICMP" protocol=icmp
add action=drop chain=input comment="defconf: drop all not coming from LAN" in-interface-list=!LAN
add action=accept chain=forward comment="defconf: accept in ipsec policy" ipsec-policy=in,ipsec
add action=accept chain=forward comment="defconf: accept out ipsec policy" ipsec-policy=out,ipsec
add action=fasttrack-connection chain=forward comment="defconf: fasttrack" connection-state=established,related
add action=accept chain=forward comment="defconf: accept established,related, untracked" connection-state=established,related,untracked
add action=drop chain=forward comment="defconf: drop invalid" connection-state=invalid
add action=drop chain=forward comment="defconf: drop all from WAN not DSTNATed" connection-nat-state=!dstnat connection-state=new in-interface-list=WAN
/ip firewall nat
add action=masquerade chain=srcnat comment="defconf: masquerade" ipsec-policy=out,none out-interface-list=WAN
add action=masquerade chain=srcnat comment="masq. vpn traffic" src-address=192.168.89.0/24
/ppp secret
add name=vpn profile=default-encryption
add name=dt profile=default-encryption service=pptp
/system clock
set time-zone-name=Asia/Kuala_Lumpur
/tool mac-server
set allowed-interface-list=LAN
/tool mac-server mac-winbox
set allowed-interface-list=LAN