Signaltap problem with Stratix 10 Production Kit

I added a constraint for altera_reserved_tck:

create_clock -period "41.667 ns" -name {altera_reserved_tck} {altera_reserved_tck}

Now I no longer get the warnings about

Warning(332182): No path is found satisfying assignment "set_max_skew -from [get_registers {auto_fab_0|alt_sld_fab_0|alt_sld_fab_0|auto_signaltap_auto_signaltap_0|sld_signaltap_inst|sld_signaltap_body|sld_signaltap_body|intel_stp_status_bits_cdc_u1|stp_status_bits_in_reg[*]}] -to [get_registers {auto_fab_0|alt_sld_fab_0|alt_sld_fab_0|auto_signaltap_auto_signaltap_0|sld_signaltap_inst|sld_signaltap_body|sld_signaltap_body|intel_stp_status_bits_cdc_u1|stp_status_bits_out[*]}] 1.000 ". This assignment will be ignored. 

Which is an improvement, but signaltap still doesn't work....